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KOS to KTM: distance & flight time
Sihanoukville (Sihanoukville International Airport) → Kathmandu (Tribhuvan International Airport)
1,675 mi
2,696 km · 1,456 nm
3h 45m
estimated nonstop flight time
-1.2h
time difference · heading northwest
See live KOS→KTM fares Phone-only fares on this route — call free
Flight time details
1,675 miles nonstop takes roughly 3h 45m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 1.2-hour time set-back when reading arrival times on your ticket.
The two airports
- KOS — Sihanoukville International Airport · Sihanoukville, Cambodia
- KTM — Tribhuvan International Airport · Kathmandu, Nepal
Distances are great-circle ("as the crow flies") — the same basis airlines use for frequent-flyer miles.
Alternate airports can cut this fare
Flying from or into a nearby airport is the #1 trick our agents use to beat online prices. Call and we'll compare every combination on one call.
Near KOS
- PQC · Phu Quoc International Airport37 mi away
- PNH · Phnom Penh International Airport106 mi away
- VKG · Rach Gia Airport110 mi away
- KZC · Kampong Chhnang Airport132 mi away
Near KTM
- SIF · Simara Airport44 mi away
- RHP · Ramechhap Airport48 mi away
- BHR · Bharatpur Airport57 mi away
- MEY · Meghauli Airport70 mi away
Frequently asked questions
How far is KOS from KTM?
The flight distance from Sihanoukville (KOS) to Kathmandu (KTM) is 1,675 miles (2,696 km, 1,456 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from KOS to KTM?
A nonstop flight takes about 3h 45m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
What is the time difference between Sihanoukville and Kathmandu?
Kathmandu is 1.2 hours behind Sihanoukville.
What is the cheapest way to fly from KOS to KTM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on KOS–KTM that never appear on search engines, with no booking fees.